Concise Enantioselective Synthesis of 3,5-Dialkyl-Substituted Indolizidine Alkaloids via Sequential Cross-Metathesis−Double-Reductive Cyclization
作者:Stefan Randl、Siegfried Blechert
DOI:10.1021/jo0346095
日期:2003.11.1
5-dialkyl-substituted indolizidine alkaloids is reported. The convergent syntheses are based on a novel sequence of a cross-metathesis (CM) reaction of an alpha,beta-unsaturated ketone and a chiral homoallylic amine followed by a domino reaction involvinghydrogenation, N-deprotection, and two diastereoselectivereductive aminations. Our concept presents one of a few examples of a highly selective CM reaction in